Movement device for a helmet for moving a first element of the helmet with respect to a second element of the helmet

ABSTRACT

A movement device for a helmet for moving a first element of the helmet with respect to a second element of the helmet is described. The movement device includes a pivot element for pivoting about an axis of rotation, and a pivot seat, in which the pivot element is arranged. The pivot element includes an eccentric portion or cam, and the pivot seat includes a first seat region and a second seat region. The first seat region is in a position angularly offset and linearly translated with respect to the second seat region. A first position of the pivot element corresponds to the first seat region and a second position of the pivot element corresponds to the second seat region.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application claims priority to Italian Patent ApplicationVR2012A000022 filed on Feb. 20, 2012.

FIELD

The present disclosure relates generally to a movement device for ahelmet. In particular, the present disclosure relates to a movementdevice for a helmet for moving a first element of the helmet withrespect to a second element of the helmet. For example, in a helmetincluding a visor and a shell, the movement device is able to move thevisor with respect to the shell of the helmet between a first operatingposition, for example active and closed position in front of the user'sface, and a second operating position, for example an inactive and openposition, i.e. raised opposite the user's forehead. Alternatively, forexample, in a helmet including a movable flap which closes an air intakeor ventilation opening in the helmet, the movement device is able tomove the movable element, with respect to a remaining portion of thehelmet, or is able to move similar elements or parts of the helmet, suchas a chin guard.

SUMMARY

According to a first aspect of the disclosure, a movement device for ahelmet for moving a first element of the helmet with respect to a secondelement of the helmet is provided, wherein said movement device includesa pivot element for pivoting the first element of the helmet withrespect to the second element of the helmet about an axis of rotation,and a seat of rotation for the pivot element, the pivot element beinglocated at least partially in the seat, wherein said pivot elementincludes an eccentric portion or cam, and said seat includes a firstseat region adapted to receive said eccentric portion in a firstposition of the pivot element, and a second seat region adapted toreceive said eccentric portion in a second position of the pivotelement, in which the first seat region is in a position angularlyoffset around the axis of rotation and linearly translated relative tothe second seat region, such that the second position of the pivotelement is angularly offset around the axis of rotation and linearlytranslated with respect to the first position of the pivot element, andvice versa.

According to a second aspect of the disclosure, a method for moving afirst element of a helmet with respect to a second element of the helmetis provided, wherein said method comprises the steps of associating apivot element of the first element, wherein said pivot element includesan eccentric portion eccentric with respect to a rotational axis of thepivot; associating a seat of rotation of the pivot with the secondelement, wherein said seat for the pivot includes a first seat regionadapted to receive said eccentric portion and a second seat regionadapted to receive said eccentric portion, and wherein said second seatregion is linearly translated and angularly offset around the axis ofrotation with respect to the first seat region; positioning the pivotelement at least partially in the seat in a first position where theeccentric portion is located in the first seat region; moving the pivotelement in a second position where the eccentric portion is located inthe second seat region; wherein, when the eccentric portion of the pivotelement passes from the first seat region to the second seat region orvice versa, the pivot element performs both a rotation to compensate forangular offsetting between the second seat region and the first seatregion and a linear displacement to compensate for linear offsettingbetween the second seat region and the first seat region.

The aforementioned movement device can therefore be applied to allprotective helmets where there is a movement of parts.

In particular, with specific reference to a helmet with visor, it isknown to perform a rotary/translational movement of the visor, namely tocause a translational movement of the visor forwards with respect to theshell, upon initial opening of the visor from the closed position, and,after the translational movement, cause a rotational movement so as tomove the visor into the open position on the user's forehead. As aresult of this rotary/translational movement it is possible to obtain ahelmet in which the visor, the chin guard or the aforementioned movableflap is located flush with the shell or a corresponding portion of thehelmet when in the closed position, or to open the visor, the chin guardor the movable flap into the open position without interfering with thevolume of the shell during the opening movement.

The known movement devices, although advantageous from many points ofview, are very complex to produce and are formed by numerous mechanismsand components, such that the helmet is very costly in manufacturingterms.

A technical problem forming the basis of the present disclosure is thatof providing a movement device for a helmet which has a simplifiedstructure and a small number of components and/or which is able toachieve further advantages. A technical problem forming the basis of thepresent disclosure is also that of providing a helmet including such adevice.

The technical problem is solved by providing a movement device for ahelmet as defined in the first aspect of the disclosure and a method asdefined in the second aspect of the disclosure.

In particular, according to the present disclosure, the seat of rotationfor the pivot has a first seat region adapted to receive an eccentricportion of the pivot element and a second seat region, separate from thefirst seat region and adapted to receive the eccentric portion of thepivot element, wherein the first seat region is in a position angularlyoffset around the axis of rotation of the pivot element and linearlytranslated relative to said second seat region, and wherein a firstposition of the pivot element corresponds to the first seat region and asecond position of the pivot element corresponds to said second seatregion, such that said second position of the pivot element is aposition rotated and linearly translated with respect to said firstposition, and vice versa.

In other words, according to the present disclosure, the seat for thepivot element has two different seat regions which are in a mutualspatial relationship, with predefined angular offsetting and linearoffsetting, such that a movement of the eccentric portion of the pivotelement between the first seat region and the second seat region, andvice versa, produces a rotary/translational movement of the pivotelement and therefore of the first element of the helmet connected tothe pivot element.

The first element of the helmet connected to the pivot element may bethe visor of the helmet, or any other movable element, such as a flapsuitable for closing a ventilation opening, or a chin guard. The secondelement of the helmet may be the shell, or for example the chin guard,if the movable flap closes a ventilation opening of the chin guard.

In this way, when it is required to open the visor, the movable flap orthe chin guard (first element), and a user starts to perform rotation ofthe first element, this produces a displacement of the eccentric portionof the pivot element, owing, for example, to the interaction between thecam element and the pivot seat, for example from the second positioninto the first position. This displacement includes both a rotation ofthe eccentric portion and therefore the rotation of the movable element,and also a linear displacement of the eccentric portion and therefore alinear displacement of the movable element, in order to compensate forthe angular and linear offsetting of the first seat region with respectto the second seat region.

Said angular and linear offsetting of the first seat region with respectto the second seat region is designed so as to correspond, for examplein the case of a visor, to a forward movement outwards of the firstelement (visor, chin guard or movable flap) away from the second element(for example shell), during opening, and a backward movement towards thesecond element during closing.

It follows that, when a user performs movement of the first element, forexample a rotation of the visor, the chin guard or the movable flap,this produces an immediate translational movement, almost as aconsequence of rotation. Basically, the rotation of the pivot in thepivot seat is able to produce a translation thereof between the two seatregions, such that the pivot performs overall a rotary/translationalmovement.

In other words, in order to perform a rotary/translational movement of avisor or other first element of the helmet, a pivot element isassociated with the first element of the helmet and a pivot seat isassociated with the second element of the helmet. With this embodimentit is possible to obtain a movement device which is very simple in thatit may be obtained by means of suitable designing of the seat regions ofthe pivot seat and the respective angular offsetting and linearoffsetting, as well as a corresponding design of the pivot element andthe eccentric portion of the pivot element.

Moreover, in this solution it is possible to obtain a direct correlationbetween angular offsetting and linear offsetting of the seat regions ofthe pivot seat and the angular displacement and linear displacement ofthe pivot element. Complicated mechanisms are therefore avoided.

According to a first aspect of the present disclosure, the pivot seatacts as a counter-cam and allows the relative angular and linearmovement of the pivot element in the pivot seat. A rotation of the pivotelement is coordinated with a translation owing to a cam/counter-caminteraction between the pivot element and the pivot seat. This meansthat, at least between the eccentric portion of the pivot element andthe respective seat regions of the pivot seat, there is a temporaryinteraction between parts, for example contact, such that between thetwo elements a thrust is created such as to cause displacement of thefirst element with respect to the second element.

In one embodiment, the seat of rotation has a recessed configurationwhich is formed in a base body integrally associated with second elementof the helmet.

In other words, the movement device comprises a base body, for example aplate-like body, having, formed in one face thereof, a recess which actsas seat of rotation for the pivot element.

In some embodiments, the recess of the base body defines in the basebody a side wall or edge. The side wall is suitably shaped so as todefine the two seat regions which correspond to the two positions of thepivot element and the respective second element.

For example, in order to favour the movement of the eccentric portionbetween the first seat region and the second seat region, the side wallor edge defining said pivot seat is a curved shaped edge.

Even more particularly, the first seat region corresponds to arespective concave profile of the side edge, and said second seat regioncorresponds to a respective convex profile of the side edge. In otherwords, between the first seat region and the second seat region, theside edge of the recess has a substantially concave/convex progression.It follows that, in order to obtain the linear displacement of theeccentric portion, a variation in the concavity/convexity of the sideedge of the recess is used.

Moreover, in some embodiments, in order to be able to control a movementof the pivot element between the first position and the second position,the pivot element comprises an eccentric appendage intended to bereceived in a third seat region with an end-of-travel function, when theeccentric portion is located in the second seat region, and in a fourthseat region also with an end-of-travel function, when the eccentricportion is located in the first seat region. This third seat region andfourth seat region may also be obtained by means of suitable shaping ofthe side edge of the recess defining the pivot seat, where thiseccentric appendage interacts with the side edge of the recess.

In some embodiments, the movement device includes a retainer assemblyfor retaining the pivot element in the first position or in the secondposition, in order to prevent undesirable movement of the pivot elementfrom the position in which it is located; this is useful for ensuringthat the movement of the pivot element between the first position andthe second position may not occur spontaneously, but only under thecontrol of the user. The retainer assembly includes, in someembodiments, an interaction element associated with the pivot element,such as a tooth, and at least one interaction counter-element,associated with the pivot seat. Either one of and/or both theinteraction element and interaction counter-element may be anelastically deformable element, the flexibility or elasticity of whichis calibrated to allow the pivot element to be retained under normalconditions without any forcing (namely when the first element of thehelmet is immobile with respect to the second element of the helmet inthe open and/or closed condition) and the pivot element to be moved, bymeans of application of a light force or pressure between theinteraction element and the interaction counter-element, when the firstelement of the helmet must be opened/closed with respect to the secondelement of the helmet.

Further advantages, characteristic features and the modes of use of themovement device, helmet and method according to the present disclosurewill become clear from the following detailed description of a number ofpreferred embodiments, provided by way of a non-limiting example.

It is clear, however, that each embodiment of the subject according tothe present disclosure may have one or more of the advantages listedabove; in any case it is not required that each embodiment should havesimultaneously all the advantages listed.

BRIEF DESCRIPTION OF THE DRAWINGS

Reference shall be made to the figures in the accompanying drawings inwhich:

FIG. 1 shows a partially cross-sectioned side view of a helmet includinga movement device according to an embodiment of the present disclosure;

FIG. 2 shows a view, on a larger scale, from a first side, of a movementdevice according to an embodiment of the present disclosure in a firstoperating condition;

FIG. 3 shows a view, on a larger scale, from a first side, of a movementdevice according to an embodiment of the present disclosure in a secondoperating condition;

FIGS. 4-6 show schematic views, from a first side, of a movement deviceaccording to an embodiment of the present disclosure in successiveoperating conditions;

FIG. 7 shows a partial view, on a larger scale, from a first side, of amovement device according to an embodiment of the present disclosure;

FIG. 8 shows a view, on a larger scale, from a second side, of amovement device according to an embodiment of the present disclosure inan operating condition;

FIG. 9 shows a further view, on a larger scale, from a second side, of amovement device according to an embodiment of the present disclosure inan operating condition;

FIG. 10 shows an axonometric view of a helmet including a movementdevice according to an embodiment of the present disclosure associatedwith a ventilation opening.

DETAILED DESCRIPTION

With reference to the accompanying figures, the reference number 10denotes a movement device according to the present disclosure.

In particular, in the example shown in the figures, the movement device10 is applied to a helmet 12 including a shell 14 protecting the head ofa user and a visor 16. The movement device 10 is intended to move thevisor 16 with respect to the shell 14 of the helmet 12 by means of arotational or pivoting movement about an axis X.

More particularly, two movement devices 10, only one of which is visiblein FIGS. 1-9, are associated with the helmet 12, said devices beingarranged on opposite sides in so-called temple regions of a user's head,namely along the sides of the helmet 12 which protect the temple zonesof the user's head. The axis X extends between one temple region andanother and is the same for both the movement devices 10.

In order to simplify illustration, in the continuation of the presentdescription, only a single movement device 10 is described, namely thedevice located in the right-hand zone of the shell 14, or in other wordsthe movement device 10 located in the user's right-hand temple region.In FIGS. 1-7 the movement device 10 is viewed from the inner side of thehelmet 12, namely the side for connection to the shell 14, while inFIGS. 8-9, the movement device 10 is viewed from the opposite side,namely from the side for connection to the visor 16 on the outer side ofthe helmet 12.

Each movement device 10 is intended to displace the visor 16 between afirst operating position, or closed position, where said visor 16 issituated opposite the user's face and has a protective function, and asecond operating position, where the visor 16 is raised opposite theuser's forehead.

It should be understood that the movement device 10 may be associatedwith any other element of the helmet, such as a chin guard or a movableflap intended to close a ventilation opening. For example FIG. 10 showsa helmet including a movable flap 116 intended to close a ventilationopening 115. The movement device 10, which is located underneath theflap 116 and therefore is not visible, is intended to move the movableflap 116 between an open position and a closed position, in the same wayas for the visor 16.

In the continuation of the description, reference will be made inparticular to the use of the movement device 10 for moving the visor 16(which represents said first element of the helmet) with respect to theshell 14 (which represents said second element of the helmet) only forthe sake of simplifying illustration.

In the example shown, the movement device 10 comprises a base body 20,or support base, integrally associated with the shell 14 of the helmet,for example by means of screws 21, and arranged inside on the shell 14,and a pivot element 24 which is movable with respect to the base body20.

In particular, the pivot element 24 includes a first head portion 22with a slender and oblong form, which is housed in a pivot seat 25formed in the base body 20. In particular, the pivot seat 25 is a recessformed in the base body 20 on one side or face of the base body.

In some embodiments, the pivot element 24 and the base body 20 are madeof metallic materials in order to ensure adequate robustness.

In other embodiments, the pivot element 24 and the base body 20 aremade, for example, of acetal resin, polycarbonate, ABS or similarmaterials which have a suitable mechanical strength.

The pivot element 24 is stably associated with the visor 16 and isrotationally integral therewith. The connection between the pivotelement 24 and the visor 16 is obtained in a known manner.

For connection to the visor 16 the pivot element 24 comprises a secondhead portion 23, opposite to the first head portion 22, in the examplehaving a substantially rectangular form (see FIGS. 8-9).

As can be seen in the drawings, the pivot element 24 includes a rotatingshaft, denoted generally by the number 27, coaxial with the axis ofrotation X of the visor 16, and an eccentric portion or cam 26 which iseccentric with respect to the axis X and associated with the first headportion 22.

With reference to FIGS. 2 and 3, according to an aspect of the presentdisclosure, the pivot seat 25 acts as a counter-cam for the eccentricportion 26 and includes a first seat region 30 adapted to receive saideccentric portion 26 and a second seat region 32 adapted to receive saideccentric portion 26, wherein the first seat region 30 is in a positionangularly offset and linearly translated with respect to said secondseat region 32. The angular offsetting of the first seat region 30 withrespect to the second seat region 32 is denoted by “α” in FIG. 3 andoccurs around the axis of rotation X.

The linear or transverse offsetting of the first seat region 30 withrespect to the second seat region 32, which in the example shown occurssubstantially in a horizontal plane, is denoted by “d” in FIG. 3.

Depending on said spatial relationship between the first seat region 30and the second seat region 32, a first position of the pivot element 24corresponds to the first seat region 30, and a second position of thepivot element 24 corresponds to said second seat region 32, such thatsaid second position is a position rotated and translated with respectto said first position.

Even more particularly, in the example shown, the first position of thepivot element 24, when the eccentric portion 26 is located in the firstseat region 30, is designed so as to correspond to a position which isfurther forwards and angularly higher than the second position of thepivot element 24, when the eccentric portion 26 is in the second seatregion 32.

It follows that, in the example shown, an open condition of the visor 16on the forehead (linearly advanced position) corresponds to the firstposition of the pivot element 24, when the eccentric portion 26 islocated in the first seat region 30. A closed condition of the visor 16(linearly retracted position flush with the shell 14) corresponds to thesecond position, when the eccentric portion 26 is located in the secondseat region 32.

The correlation between the open position and the closed position of thevisor 16 and the positions of the eccentric portion 26 of the pivotelement 24 in the seat 25 is visible in FIGS. 4-6.

Even more particularly, in order to open or close the visor 16, a useracts in the manner described below.

Initially, the visor 16 is located, for example, in the open position onthe forehead. Therefore, the eccentric portion 26 is located in thefirst seat region 30.

When the visor 16 is lowered, the eccentric portion 26 passes from thefirst seat region 30 to the second seat region 32, and the pivot element24 performs a rotation to compensate for angular offsetting between thetwo seat regions 30, 32, and a backwards translation to compensate forlinear offsetting between the two seat regions 30, 32.

Consequently the visor 16 is retracted towards the shell and in theclosed position is located flush with the shell 14.

Vice versa, in order to open the visor 16, the eccentric portion 26passes from the second seat region 32 to the first seat region 30, andthe pivot element 24 performs not only a rotation, but also a forwardstranslation so that the visor moves outwards beyond the volume of theshell 14.

With reference to FIGS. 2 and 3, it can also be seen that the pivot seat25 is substantially a recess formed in the base body 20, on one face ofthe base body 20.

The recess defines a side wall or edge 35 in the base body 20.

The side edge 35 is suitably shaped to define the first seat region 30and the second seat region 32, namely the first seat region 30 and thesecond seat region 32 are defined by shaping of the side edge 35 of thebase body 20.

The profile of the side edge 35 is substantially concave/convex, with aflexion, i.e. has a depression/hump, between the first seat region 30and the second seat region 32.

In particular, the side edge 35 has a profile which is concave, namelydefines a depression or groove, in the first seat region 30, and aprofile which is slightly convex, namely defines a slight projection orhump, in the second seat region 32.

Owing to this concave/convex shape of the side edge 35 of the base body20 it is possible to obtain a homogeneous and continuousrotary/translational movement of the pivot element 24.

With reference to FIGS. 2 and 3, it can also be noted, moreover, thatthe first head portion 22 of the pivot element 24 comprises, in additionto the eccentric portion 26, an eccentric projecting appendage 36 whichis arranged on the substantially opposite side of the axis X to theeccentric portion 36 and interacts with further seat regions of the seat25.

This appendage 36 has the function of interacting with the side edge 35of the base body 20 both to guide displacement of the pivot element 34from the second (retracted) position to the first (advanced) positionand to define a so-called end-of-travel stop for the movement of thepivot element 24 into the two positions. In particular, the seat 25comprises on the substantially opposite side of the axis of rotation X,a third seat region 40 intended to receive the eccentric appendage 36,when the eccentric portion 26 is located in the second seat region 32,and a fourth seat region 42 intended to receive the eccentric appendage36, when the eccentric portion 26 is located in the first seat region30.

The third seat region 40 and the fourth seat region 42 are also definedby a concave shaping of the edge 35. In fact the edge 35 has respectiveconcave depressions with the formation of shoulders 45, 46 in the thirdseat region 40 and fourth seat region 42, said shoulders 45, 46 actingas end-of-travel stops. Moreover, the edge 35 situated between the thirdseat region 40 and the fourth seat region 42 is shaped so as to obtain alinear displacement of the pivot element 42 when it is moved from thesecond (retracted) position to the first (advanced) position.

With reference to FIGS. 7-9, it can also be seen that the movementdevice 10 includes a retainer assembly 50 for retaining the pivotelement 24 in the first position or in the second position, preventingundesirable movement of the pivot element 24 from the respective firstposition or second position. For this purpose, the base body 20comprises, on the side/face opposite to the pivot seat 25, a cavity 51which houses a spring 52, in the example an undulating linear spring.

Basically, the base body 20 has on a first side or face the pivot seat25 and, on the other side or face, the cavity 51 for the retainerassembly 50 and, in particular, in the example shown, for the linearundulating spring 52.

The spring 52 is defined by a suitable profile and, in the embodimentshown, comprises in particular three undulations, defining twocorresponding lateral humps 53, 55 and a corresponding central hump 54and respective intermediate depressions and is positioned in the cavity51 so as to be able to be flexed in a direction at right angles to thedirection of the axis of rotation X of the pivot element 24.

The spring 52 is able to interact with an interaction element which isassociated with the pivot element and in the example of embodiment is atooth 56 having, in the example, a rounded profile.

The tooth 56 and the linear undulating spring 52 are relatively arrangedand designed so that, when the eccentric portion 26 is located in thefirst seat region 30, the tooth 56 is stably housed in one of the twodepressions between two humps, for example between the two humps 53, 54of the spring 52, and, when the eccentric portion 26 is located in thesecond seat region 32, the tooth 56 is stably housed in the otherdepression between the other two humps, for example between the twohumps 54, 55 of the spring 52.

Basically, the tooth 56 acts as an interaction element and the spring asan interaction counter-element. The profile of the spring 56 thus allowsthe interaction element to be retained under normal conditions withoutforcing (namely when the visor 16 of the helmet is immobile with respectto the shell 14 in the open and/or closed condition) both in the firstposition and in the second position and prevent undesirable movements ofthe visor 16. A single spring 52 is thus used to keep the pivot element24 fixed in the two positions.

In fact, when it is required to perform an opening and/or closingmovement of the visor 16 of the helmet, and the pivot element 24 isdisplaced between the first position and the second position and viceversa, the tooth passes from one position to the other, deforming theprofile of the spring and counteracting the elastic force of the latter.Once passed over, owing to the elastic return movement of the spring 52,the latter is repositioned in the original position, retaining again thetooth 56 of the pivot element 24.

Owing to this elastic configuration of the retainer assembly, a soft anddampened movement of the visor may be obtained during the opening andclosing operations.

The movement device of the present disclosure has been describedhitherto with reference to preferred embodiments thereof. It isunderstood that other embodiments relating to the same inventive ideamay exist, all of these falling within the scope of protection of theclaims which are provided hereinbelow.

1. A movement device for a helmet for moving a first element of thehelmet with respect to a second element of the helmet, comprising: apivot element for pivoting a first element of the helmet with respect toa second element of the helmet about an axis of rotation, and a seat ofrotation for the pivot element, wherein the pivot element is located atleast partially in the seat and includes an eccentric portion or cam,and wherein said seat includes a first seat region adapted to receivesaid eccentric portion in a first position of the pivot element, and asecond seat region adapted to receive said eccentric portion in a secondposition of the pivot element, in which the first seat region is in aposition angularly offset around the axis of rotation and linearlytranslated relative to the second seat region, such that the secondposition of the pivot element is angularly offset around the axis ofrotation and linearly translated with respect to the first position ofthe pivot element, and vice versa.
 2. The movement device according toclaim 1, wherein the eccentric portion is configured to cooperate withthe seat of rotation causing a displacement of the pivot element fromthe first position to the second position, upon an angular displacementof the first element with respect to the second element about the axisof rotation.
 3. The movement device according to claim 1, furthercomprising a base body fixed to the second element of the helmet,wherein the base body has a recess delimited by a side edge or wall,said recess defining said seat for the pivot and acting as a counter-camfor said eccentric portion.
 4. The movement device according to claim 3,wherein the side edge or wall is shaped to define said first seat regionand said second seat region.
 5. The movement device according to claim4, wherein the side edge or wall has a respective concave profile fordefining said first seat region and a convex profile for defining saidsecond seat region.
 6. The movement device according to claim 1, whereinthe pivot element comprises an eccentric appendage received in the seatfor the pivot element and adapted to be placed in further regions of theseat of rotation, and wherein the eccentric appendage is configured tocooperate with the seat of rotation, causing a displacement of the pivotelement from the second position to the first position upon an angulardisplacement of the first element with respect to the second elementabout the axis of rotation.
 7. The movement device according to claim 6,wherein the seat further comprises a third seat region intended toreceive the eccentric appendage, when an eccentric portion is located inthe second seat region, and a fourth seat region intended to receive theeccentric appendage, when the eccentric portion is located in the firstseat region.
 8. The movement device according to claim 3, wherein theside edge defining the seat defines a first shoulder in a third seatregion, with an end-of-travel function for the eccentric portion, and asecond shoulder in a fourth seat region, with an end-of-travel function.9. The movement device according to claim 1, further comprising aretainer assembly for retaining the pivot element in the first positionand/or in the second position, said retainer assembly including aninteraction element associated with the pivot element and at least oneinteraction counter-element associated with the seat for the pivot. 10.The movement device according to claim 9, wherein at least one of theinteraction element and the at least one interaction counter-element isan elastically deformable element.
 11. The movement device according toclaim 9, wherein the interaction element is a tooth and the at least oneinteraction counter-element comprises a spring, wherein the tooth isadapted to deform a profile of the spring counteracting an elastic forceof the spring upon passage of said pivot element between the firstposition and the second position and vice versa, and wherein, when thepivot element is in the first position or in the second position, thespring is in an original rest position and retains the tooth of thepivot element.
 12. A helmet including the movement device according toclaim
 1. 13. The helmet according to claim 12, including a visor and/ora chin guard, wherein the visor or the chin guard is said first elementof the helmet.
 14. The helmet according to claim 12, including a movableflap adapted to close a ventilation opening, wherein said movable flapis said first element of the helmet.
 15. A method for moving a firstelement of a helmet with respect to a second element of the helmet, saidmethod comprising the steps of: associating a pivot element with thefirst element, wherein said pivot element includes an eccentric portioneccentric with respect to a rotational axis of the pivot element;associating a seat of rotation for the pivot element with the secondelement, wherein said seat for the pivot element includes a first seatregion adapted to receive said eccentric portion and a second seatregion adapted to receive said eccentric portion, and wherein saidsecond seat region is linearly translated and angularly offset around arotational axis with respect to the first seat region; positioning thepivot element at least partially in the seat in a first position wherethe eccentric portion is located in the first seat region; and movingthe pivot element in a second position where the eccentric portion islocated in the second seat region, wherein, when the eccentric portionof the pivot element passes from the first seat region to the secondseat region or vice versa, the pivot element performs both a rotation tocompensate for angular offsetting between the second seat region and thefirst seat region and a linear displacement to compensate for linearoffsetting between the second seat region and the first seat region. 16.The method according to claim 15, wherein the linear displacement is aforward or backward movement of the first element of the helmet withrespect to the second element of the helmet, for spacing apart or movingthe first element of the helmet respectively away from or towards thesecond element of the helmet.
 17. The method according to claim 15,wherein: the first element of the helmet is a visor, a chin guard or amovable flap of the helmet, when the eccentric portion is located in thefirst seat region, the first position corresponds to an open conditionof the visor, the chin guard or the movable flap and, when the eccentricportion is located in the second seat region, the second positioncorresponds to a closed condition of the visor, the chin guard or themovable flap.
 18. The method according to claim 15, wherein theeccentric portion moves between said first seat region and said secondseat region by means of interaction with a side edge of the seat, saidside edge being shaped to define the first seat region and the secondseat region.
 19. The method according to claim 15, wherein: the pivotelement is retained in said first position or in said second position byinteraction between an interaction element associated with the pivotelement and an interaction counter-element associated with the pivotseat, and at least one of said interaction element and said interactioncounter-element is elastically deformable elements such that when thepivot element passes from the first position to the second position orvice versa, at least one of said interaction element and saidinteraction counter-element is subject to an elastic deformation.